Published on *Max Planck Institute for Mathematics* (https://www.mpim-bonn.mpg.de)

Posted in

- Talk [1]

Speaker:

Albert Schwarz
Affiliation:

University of California, Davis
Date:

Tue, 2019-12-03 14:00 - 15:00 I give a formulation of quantum theory where the starting point is a convex set of states. I show that

the formulas for probabilities can be derived from first principles. One can define particles as

elementary excitations of ground state and quasiparticles as elementary excitations of translation invariant stationary state. The collisions of (quasi)particles in the geometric approach are described by inclusive scattering matrix. (Inclusive cross-sections can be expressed in terms of inclusive scattering matrix. Only

inclusive cross sections make sense for collisions of quasiparticles.)

**Links:**

[1] https://www.mpim-bonn.mpg.de/taxonomy/term/39

[2] https://www.mpim-bonn.mpg.de/node/3444

[3] https://www.mpim-bonn.mpg.de/node/5312